Supplying 48 WKDL Air Coolers for a Cold Storage Warehouse Complex in Southeast Asia
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Cold chain logistics is one of the fastest-growing sectors in Southeast Asia, driven by rising consumer demand for frozen foods, fresh produce, and pharmaceutical cold storage. When a regional cold chain operator expanded into Vietnam with a major new warehouse complex, they needed reliable, CE-certified air coolers at a price point that made the project financially viable. Hicool supplied 48 WKDL air cooler units — a mix of ceiling coolers and floor-standing freezer units — delivering the complete order in 35 days and saving the client 45% compared to the European brand quotation they had received.
Project Background
The client is a cold chain logistics operator headquartered in Southeast Asia, serving food manufacturers, supermarket chains, and pharmaceutical distributors. Their Vietnam expansion project involved constructing a 12,000 m2 multi-temperature warehouse facility near a major port city, designed to handle:
- Frozen storage (-25C to -18C): 4,800 m2 for frozen seafood, meat, and ice cream
- Chilled storage (0C to +4C): 4,200 m2 for fresh produce, dairy, and beverages
- Loading dock (+10C to +15C): 1,800 m2 temperature-controlled receiving and dispatch area
- Blast freezing (-35C): 1,200 m2 quick-freeze area for incoming products
The refrigeration system design called for an ammonia (R717) central plant with glycol or direct expansion distribution to the cold rooms. The air cooler specification required units with high airflow capacity, hot gas defrost capability, and CE certification — the latter being a requirement from their European insurance underwriter.
The Challenge
The client had initially obtained quotations from two European air cooler brands. While the product quality was not in question, the total cost for 48 air cooler units was significant — and the project budget was tight. The financial model required air cooler procurement costs to be substantially lower than the European quotations to maintain the target ROI for investors.
Additionally, the construction timeline was aggressive. The general contractor had scheduled the refrigeration system installation phase to begin in 5 weeks, meaning the air coolers needed to arrive on-site within that window to avoid construction delays.
The client's requirements:
- CE-certified air coolers from a reputable manufacturer
- Performance specifications matching or exceeding the original European brand specifications
- Significant cost savings vs the European quotation
- Delivery within 5 weeks to the project site in Vietnam
- Consistent quality across all 48 units — no variance in performance
Our Solution
Manufacturer Selection: Why WKDL
We recommended WKDL (Wanke Deli) based on our long-standing partnership and track record of successful cold storage projects. WKDL's advantages for this project included:
- CE certification for all DL and DJ series models
- Production capacity to handle a 48-unit batch order within the required timeline
- Proven performance data from previous installations in similar climate conditions
- Hot gas defrost capability as standard on freezer models
- Competitive pricing with transparent cost structure
Technical Specification and Model Selection
Working with the client's refrigeration engineer, we matched WKDL models to the cooling requirements for each zone. The final specification:
| Zone | Temperature | Model | Cooling Capacity | Qty | Key Features |
|---|---|---|---|---|---|
| Frozen storage | -25C | DJ-40 | 40 kW per unit | 16 | Hot gas defrost, stainless steel drip tray, EC fans |
| Chilled storage | 0C to +4C | DL-80 | 80 kW per unit | 14 | Electric defrost, high airflow, ceiling mount |
| Loading dock | +10C | DL-60 | 60 kW per unit | 8 | High air throw distance, robust construction |
| Blast freezing | -35C | DJ-80 | 80 kW per unit | 10 | High-velocity fans, hot gas defrost, SS housing |
Total: 48 units — 16x DJ-40, 14x DL-80, 8x DL-60, 10x DJ-80
Electrical Customization
Vietnam uses 380V/50Hz power supply. All fan motors and defrost heaters were specified accordingly. WKDL's standard production line accommodates 380V/50Hz as a standard option, so no custom engineering was required — this avoided the lead time penalty that sometimes applies for non-standard voltages.
Production and Quality Control
The 48 units entered production within 3 days of order confirmation. Our quality control process included:
- Material verification — Confirmed copper tube and aluminum fin material certificates, checked fin spacing and tube diameter against specifications
- In-process inspection (Day 12) — Visited the WKDL factory to inspect the first batch of completed units. Checked coil construction, fan motor wiring, defrost heater installation, and drip tray integrity
- Pressure testing — Every unit was pressure-tested at 2.5 MPa (nitrogen) to verify coil integrity — no leaks accepted
- Performance spot-check — Randomly selected 4 units (one of each model) for airflow measurement and capacity verification against the data sheet
- Final inspection and packing (Day 28) — All 48 units inspected for shipping damage, correct labeling (model, serial number, electrical specs), and export packing quality
Logistics
The 48 units were packed in wooden crates with moisture barrier and foam protection. Total shipment volume: approximately 85 CBM across two 40-foot containers. Shipped CIF to the nearest Vietnamese port, with inland trucking arranged by the client's freight forwarder. Total transit time from factory gate to project site: 7 days.
Results
| Metric | Target | Actual |
|---|---|---|
| Order to delivery | 5 weeks | 35 days (5 weeks) |
| Cost vs European quotation | Significant savings | 45% total cost reduction |
| CE certification | All units | All 48 units CE-certified |
| Quality issues | Zero | Zero — all units passed installation checks |
| Performance | Meet or exceed spec | All zones reached design temperature within 4 hours of commissioning |
Client Feedback
The client's project manager confirmed that all 48 units were installed without issues and that the warehouse reached design temperatures within 4 hours of the refrigeration system commissioning. Six months after commissioning, no warranty claims had been filed, and the units were performing to specification with normal maintenance intervals.
The 45% cost saving on air coolers contributed directly to bringing the overall project budget under the investor's target, helping secure approval for a second warehouse project in a neighboring country — for which Hicool has been engaged as the air cooler supplier.
Key Takeaways for Cold Storage Project Buyers
- Chinese air coolers deliver real value — For standard cold storage applications, CE-certified Chinese air coolers from reputable manufacturers like WKDL provide equivalent performance to European brands at 40-50% lower cost.
- Batch ordering improves economics — Ordering all units from a single manufacturer in one batch maximizes production efficiency, reduces per-unit costs, and ensures consistent quality across all units.
- Quality control is non-negotiable — The cost savings only work if every unit performs to specification. In-factory inspection during production and pressure testing of every unit are essential practices.
- Start sourcing early — Even with WKDL's efficient production, allowing 5-6 weeks from order to delivery provides adequate buffer for production, inspection, and international shipping.
How Hicool Can Help
Hicool is a dedicated sourcing partner for industrial air coolers and cold chain equipment from China. We work with WKDL and other qualified manufacturers to supply air coolers for cold storage, food processing, and industrial refrigeration projects worldwide. From technical specification matching through production quality control and export logistics, we manage the entire procurement process. Browse our air cooler range or contact us to discuss your cold storage project requirements.
Frequently Asked Questions
What warranty comes with WKDL air coolers supplied through Hicool?
WKDL provides a standard 18-month warranty from date of shipment covering manufacturing defects in materials and workmanship. This includes the coil, housing, fan motors, and defrost components. Warranty excludes damage from improper installation, refrigerant contamination, or voltage irregularities. Hicool facilitates warranty claims and arranges replacement parts shipment when needed.
Can WKDL air coolers work with ammonia (R717) refrigeration systems?
Yes. WKDL produces ammonia-compatible air coolers with steel tube construction (instead of copper) and appropriate design pressure ratings. For this particular project, the chilled storage units used glycol as the secondary refrigerant (with ammonia in the central plant only), while the freezer units were direct expansion with R404A. Ammonia-direct air coolers are available and priced slightly higher due to steel tube construction.
How do WKDL air coolers compare to Guntner, Alfa Laval, or Kelvion?
For standard cold storage applications (the primary use case), WKDL units deliver comparable cooling performance and reliability at 40-50% lower cost. European brands may offer advantages in advanced controller integration, specialized coatings for demanding environments (e.g., offshore or chemical exposure), and premium EC motor options. For the vast majority of commercial cold storage projects, WKDL provides excellent value without compromising performance.
Planning a cold storage project? Contact us or email sales@hiqool.com for air cooler specifications and project pricing.
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